| Thanks everyone. In order to be more specific regarding the future readers of this post, I am using Ubuntu 12.04 and GNU Radio v3.7.2. I am using the embedded gr_modtool in order to create a custom signal processing block from scratch. My block does not use FFT. Finally, the problem was solved by just ignoring the implementation header file and only include the public header file in the /include/nameofBlock .
Thanks, -George
Ah, nevermind about the wiki edit. The use of pure virtual functions is already discussed in http://gnuradio.org/redmine/projects/gnuradio/wiki/BlocksCodingGuide . Still, the gr_modtool addition may be useful.
-----Original Message-----
From: address@hidden [mailto:address@hidden] On Behalf Of Nowlan, Sean
Sent: Wednesday, March 05, 2014 4:45 PM
To: Marcus Müller; George Sklivanitis; GNURadio Discussion List
Subject: Re: [Discuss-gnuradio] Problem with undefined symbol in new block created by gr_modtool in 3.7.2
The first place I'd look is in your_block.h. Did you remember to declare any public member functions to be pure virtual in that file, and then declare your (non-virtual) functions in your_block_impl.h? If you forgot to declare pure virtual functions, i.e., "virtual return_type your_block(args_list) = 0;" in your_block.h, it will compile but you will get the undefined symbol at runtime.
This probably a common pitfall and it might be worth making a note in the wiki for OutOfTreeModules. I'll add that.
Architects of gr_modtool... can you add an autogen comment in *.h files reminding the user to declare pure virtual functions? I think users who don't deeply understand OO and particularly its C++ syntax would benefit from this reminder. I think it's a common paradigm to use other examples to fill in the "guts" of gr_modtool generated C++ code, but things like this are easy to miss.
Sean
-----Original Message-----
From: address@hidden [mailto:address@hidden] On Behalf Of Marcus Müller
Sent: Wednesday, March 05, 2014 3:21 PM
To: George Sklivanitis; GNURadio Discussion List
Subject: Re: [Discuss-gnuradio] Problem with undefined symbol in new block created by gr_modtool in 3.7.2
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Hi George,
This is a little unspecific. Most probably you have a problem similar to the fftw- related problem of activecat, but that's only guessing... Please heed http://gnuradio.org/redmine/projects/gnuradio/wiki/ReportingErrors when reporting errors.
Greetings,
Marcus
On March 5, 2014 8:57:46 PM CET, George Sklivanitis <address@hidden> wrote:
Hello all,
I am dealing with the problem of undefined symbol when trying to
execute a python script for testing my new custom block created in GNU
Radio 3.7.2.
I used gr_modtool for creating the new block and also followed the
instructions posted at
http://gnuradio.org/redmine/projects/gnuradio/wiki/OutOfTreeModulesConf
ig
for correctly configuring it but the problem still holds.
Any ideas?
Thanks,
-George
--
Sklivanitis Georgios
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